Programming tools on Mac

First off I want to say I need to figure out why XCode won't install on my system. I have a MacMini which came with Panther pre-installed.
I then installed Tiger and tried to install XCode from the Tiger dvd. It then complained about me not running Panther (and that it's version is for panther).
So I dl the stuff from ADC which says it's for Tiger and they return the same message.

What is going on? Can someone help me?

Also I'd like to ask if there's something like Scite on the Mac.
For those that are not familiar with Scite I'll note it's a general purpose developer oriented text editor. That is it can handle syntax highlighting for many languages not just one and is a pretty good editor for working on non-IDE environment.